Alice Wismath, a computer science student at Queen's University in Canada, has developed a form of chess in which the type of a given piece on the board is in a state of flux:

In the quantum chess computer game created by undergraduate computer science student Alice Wismath, a piece that should be a knight could simultaneously also be a queen, a pawn or something else. The player doesn't know what the second state might be or which of the two states the piece will choose when it is moved.[...]

Wismath also chose new rules to make the game workable with its quantum twist. For example, her version of quantum chess requires a player to capture the king, which never changes to another piece, instead of merely delivering a checkmate. Also, pieces change states only when they land on black squares.

@ted: lol good point, but flawed. :) What if then next time you go to move the chess piece that has the king in check mate and it turns into a pawn? Then its no longer check mate. I guess you'd need a lot of luck with RNGs.

Yes! More chess. This and the twelve awesome chess sets posted earlier help show KIDS THESE DAYS some of the infinitude to be explored in chess. MORE please.BTW there was a 'fake advertisement' for Quantum Chess in Games Magazine years ago.